package com.lin.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.lin.reggie.utils.BaseContext;
import com.lin.reggie.utils.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/**
 * @auther lin
 * @create 2022-05-26 10:43
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路劲匹配器
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request =(HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info(requestURI);
        //放行的路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/** "
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理，直接放行
        if (check==true){
            filterChain.doFilter(request,response);
            log.info("本次请求不需要处理");
            return;
        }
        //4.判断登录状态，如果已经登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            Long employeeId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(employeeId);
            filterChain.doFilter(request,response);
            log.info("已经登录");
            return;
        }
//4-2判断移动端登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            //log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            //把用户id存储到本地的threadLocal
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        //5.如果未登录则返回未登录结果
        //将R对象转换未为输出流写回去
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("未登录，回到登录页面");
        return;
    }

    //判断路径是否需要处理的方法
    public boolean check(String[] urls,String requestURI){
        for (String url:urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
